In this paper, the phase modulator optical phase drift reduction method is proposed and researched for LiNbO3 multi-functional integrated optical chip as a part of a fiber-optic gyroscope. This approach consists of applying a very high-frequency noise signal to a phase modulator in the range from 20 MHz to 100 MHz, which is outside of a fiber-optic gyroscope operating frequency range. The presented method showed that the increase in very high-frequency noise signal voltage up to around 1.7 half-wave voltages of the phase modulator allows decreasing optical phase drift by more than 4 times in the frequency range below 64.5 kHz.
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